To run an MK11 mod on your Android device, you will need three primary components: PPSSPP - PSP emulator (available on Google Play).
Since you are looking for a "Mortal Kombat 11 PPSSPP file download for Android," you likely already know how to find ROMs. But to keep your device safe, follow these rules: Mortal Kombat 11 Ppsspp File Download For Android
For the official NetherRealm experience on Android, you should download Mortal Kombat Mobile directly from the Play Store. To run an MK11 mod on your Android